Dorothy's role is parallel to that of Arthur in the first season. He was a little, seventh grader, who had no friends, and his sister did not acknowledge him. For Dorothy, telling her friends that Arthur was rich, and making bets on it is her thrill. She feels upset that Arthur does not acknowledge her, but she later makes her own friends, and does not need him as much.

She originally had a crush on Yick Yu, even asking Arthur if he liked her. After Yick's obvious disinterest in her, she gave up after a year.

Trivia

Although she is the younger cousin of Arthur and Stephanie, her last name is never revealed.